Preserve original katakana matches

[birtles]

Reported by email:

When hovering over a word that has multiple surface forms in jmdict, 10ten displays all of them, starting with the form that the user is hovering over. But there's one exception to this: entries that have separate hiragana and katakana and surface forms (e.g. バカ売れ/ばか売れ, ガタガタ/がたがた). In this case, 10ten always shows the hiragana form first, and doesn't show the katakana form at all for kana-only entries.

I've fixed this locally by brute force, but I'd like to see if there's a more elegant approach.

A few test cases:

• バカ売れ
• バカ売れした
• バカ売れシタ
• サボった
• サボッタ
• ガタガタ